On Mon, 1 Jun 2009, Bruce Simpson wrote:
Jilles Tjoelker wrote:
If process-shared semaphores really work, then the above structure is
not a pathological case. Effectively, sem_t is carved in stone. So
process-private semaphores should continue to have most of their stuff
in a separately allocated structure, to preserve flexibility.
There was an inadvertent race in FreeBSD's POSIX semaphores which I fixed in
HEAD and STABLE about 6 weeks before 7.2 was released.
I believe process-shared POSIX semaphores now work -- the Python
'multiprocessing' regression test now runs to completion with no errors on
both HEAD and STABLE.
Process-shared semaphores, mutexes, etc, will never work
until their public types are structs, not pointers to
structs (i.e. allocated by our library functions).
The intrinsic *kernel* semaphore functions (ksem) supposedly
do support process-shared semantics, but our POSIX functions'
use of them cannot be shared across processes.
--
DE
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